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Default to 'true' for unset EnableDefaultPageItems and EnableDefaultApplicationDefinition in Microsoft.NET.Sdk.WindowsDesktop.props to allow MSBuild's CheckForDuplicateItems to provide a descriptive duplicate Page error. The check was previously no-op'd in the target due to unset properties.

Builds with duplicate Page items now fail with this error:

C:\Program Files\dotnet\sdk\3.0.100-preview8-013270\Sdks\Microsoft.NET.Sdk.WindowsDesktop\targets\Microsoft.NET.Sdk.WindowsDesktop.targets(21,5): error NETSDK1022: Duplicate 'Page' items were included. The .NET SDK includes 'Page' items from your project directory by default. You can either remove these items from your project file, or set the 'EnableDefaultPageItems' property to 'false' if you want to explicitly include them in your project file. For more information, see https://aka.ms/sdkimplicititems. The duplicate items were: 'Themes\Generic.xaml' [I:\test\XSecControls\XSecControls.csproj]

Provides a better error message for #1264.

@ghost ghost requested review from rladuca, stevenbrix and vatsan-madhavan July 17, 2019 20:59
@ghost ghost added the PR metadata: Label to tag PRs, to facilitate with triage label Jul 17, 2019
@ghost ghost requested a review from SamBent July 17, 2019 20:59
@ryalanms ryalanms merged commit f85c653 into master Jul 17, 2019
@vatsan-madhavan vatsan-madhavan deleted the dev/ryalanms/error_on_duplication_page_items branch August 23, 2019 20:12
@ghost ghost locked as resolved and limited conversation to collaborators Apr 16, 2022
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